<!DOCTYPE html>

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title></title>
    <script src="./js/vue.js"></script>
</head>

<body>
    <div id="app">
        在日本这个游戏机是:{{price}},含税价格{{price1}}元，折合人民币{{price2}}元。

        <button @click="btnclick(1000)">加价1000</button>
    </div>
    <script>
        var vm = new Vue({
            el: '#app',
            data: {
                price:29980,
                price1:0,
                price2:0
            },
            methods: {
                btnclick(newprice){
                    this.price += newprice;
                }
            },
            watch:{
                // watch:{
                    // 被监听的数据(newval ,oldval)
                    //相关代码逻辑
                // }
                price(newval ,oldval){
                    this.price1 = this.price*1.08;
                    this.price2 = Math.round( this.price1/16.75);
                }
            }
        })
    </script>
</body>

</html>